package com.emotion.controller;

import com.baomidou.mybatisplus.core.metadata.IPage;
import com.emotion.common.PageResult;
import com.emotion.common.Result;
import com.emotion.dto.request.PageRequest;
import com.emotion.dto.response.BaseResponse;
import com.emotion.entity.UserStats;
import com.emotion.service.UserStatsService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.validation.annotation.Validated;
import org.springframework.web.bind.annotation.*;

import javax.validation.constraints.NotBlank;
import javax.validation.constraints.NotNull;
import java.time.format.DateTimeFormatter;
import java.util.List;
import java.util.stream.Collectors;

/**
 * 用户统计控制器
 * 
 * @author emotion-museum
 * @date 2025-07-23
 */
@RestController
@RequestMapping("/user-stats")
public class UserStatsController {

    @Autowired
    private UserStatsService userStatsService;

    private static final DateTimeFormatter DATE_TIME_FORMATTER = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");

    /**
     * 分页查询用户统计
     */
    @GetMapping("/page")
    public Result<PageResult<UserStatsResponse>> getPage(@Validated PageRequest request) {
        IPage<UserStats> page = userStatsService.getPage(request);
        List<UserStatsResponse> responses = page.getRecords().stream()
                .map(this::convertToResponse)
                .collect(Collectors.toList());
        
        PageResult<UserStatsResponse> pageResult = new PageResult<>();
        pageResult.setCurrent(page.getCurrent());
        pageResult.setSize(page.getSize());
        pageResult.setTotal(page.getTotal());
        pageResult.setPages(page.getPages());
        pageResult.setRecords(responses);
        
        return Result.success(pageResult);
    }

    /**
     * 根据用户ID获取统计信息
     */
    @GetMapping("/user/{userId}")
    public Result<UserStatsResponse> getByUserId(@PathVariable String userId) {
        UserStats stats = userStatsService.getByUserId(userId);
        if (stats == null) {
            return Result.notFound("用户统计不存在");
        }
        return Result.success(convertToResponse(stats));
    }

    /**
     * 根据用户ID和统计类型获取统计信息
     */
    @GetMapping("/user/{userId}/type/{statsType}")
    public Result<UserStatsResponse> getByUserIdAndStatsType(@PathVariable String userId, @PathVariable String statsType) {
        UserStats stats = userStatsService.getByUserIdAndStatsType(userId, statsType);
        if (stats == null) {
            return Result.notFound("用户统计不存在");
        }
        return Result.success(convertToResponse(stats));
    }

    /**
     * 根据统计类型查询统计信息
     */
    @GetMapping("/type/{statsType}")
    public Result<List<UserStatsResponse>> getByStatsType(@PathVariable String statsType) {
        List<UserStats> statsList = userStatsService.getByStatsType(statsType);
        List<UserStatsResponse> responses = statsList.stream()
                .map(this::convertToResponse)
                .collect(Collectors.toList());
        return Result.success(responses);
    }

    /**
     * 查询用户的所有统计类型
     */
    @GetMapping("/user/{userId}/all")
    public Result<List<UserStatsResponse>> getAllStatsByUserId(@PathVariable String userId) {
        List<UserStats> statsList = userStatsService.getAllStatsByUserId(userId);
        List<UserStatsResponse> responses = statsList.stream()
                .map(this::convertToResponse)
                .collect(Collectors.toList());
        return Result.success(responses);
    }

    /**
     * 查询排名前N的用户统计
     */
    @GetMapping("/type/{statsType}/top")
    public Result<List<UserStatsResponse>> getTopUsersByStatsType(@PathVariable String statsType, @RequestParam(defaultValue = "10") Integer limit) {
        List<UserStats> statsList = userStatsService.getTopUsersByStatsType(statsType, limit);
        List<UserStatsResponse> responses = statsList.stream()
                .map(this::convertToResponse)
                .collect(Collectors.toList());
        return Result.success(responses);
    }

    /**
     * 查询用户在指定统计类型中的排名
     */
    @GetMapping("/user/{userId}/type/{statsType}/rank")
    public Result<Long> getUserRankByStatsType(@PathVariable String userId, @PathVariable String statsType) {
        Long rank = userStatsService.getUserRankByStatsType(userId, statsType);
        return Result.success(rank);
    }

    /**
     * 创建或更新用户统计
     */
    @PostMapping
    public Result<UserStatsResponse> createOrUpdate(@RequestBody @Validated UserStatsCreateRequest request) {
        UserStats stats = userStatsService.createOrUpdateUserStats(
                request.getUserId(),
                request.getStatsType(),
                request.getValue(),
                request.getPeriod()
        );
        return Result.success(convertToResponse(stats));
    }

    /**
     * 更新用户统计值
     */
    @PutMapping("/user/{userId}/type/{statsType}")
    public Result<Void> updateStatsValue(@PathVariable String userId, @PathVariable String statsType, @RequestParam Double value) {
        boolean updated = userStatsService.updateStatsValue(userId, statsType, value);
        if (!updated) {
            return Result.error("更新失败");
        }
        return Result.success();
    }

    /**
     * 增加用户统计值
     */
    @PutMapping("/user/{userId}/type/{statsType}/increment")
    public Result<Void> incrementStatsValue(@PathVariable String userId, @PathVariable String statsType, @RequestParam Double increment) {
        boolean updated = userStatsService.incrementStatsValue(userId, statsType, increment);
        if (!updated) {
            return Result.error("增加失败");
        }
        return Result.success();
    }

    /**
     * 重新计算用户统计
     */
    @PutMapping("/user/{userId}/recalculate")
    public Result<Void> recalculateUserStats(@PathVariable String userId) {
        boolean recalculated = userStatsService.recalculateUserStats(userId);
        if (!recalculated) {
            return Result.error("重新计算失败");
        }
        return Result.success();
    }

    /**
     * 重新计算所有用户统计
     */
    @PutMapping("/recalculate-all")
    public Result<Void> recalculateAllUserStats() {
        boolean recalculated = userStatsService.recalculateAllUserStats();
        if (!recalculated) {
            return Result.error("重新计算失败");
        }
        return Result.success();
    }

    /**
     * 查询平均统计值
     */
    @GetMapping("/type/{statsType}/avg")
    public Result<Double> getAvgValueByStatsType(@PathVariable String statsType) {
        Double avgValue = userStatsService.getAvgValueByStatsType(statsType);
        return Result.success(avgValue);
    }

    /**
     * 查询最大统计值
     */
    @GetMapping("/type/{statsType}/max")
    public Result<Double> getMaxValueByStatsType(@PathVariable String statsType) {
        Double maxValue = userStatsService.getMaxValueByStatsType(statsType);
        return Result.success(maxValue);
    }

    /**
     * 查询最小统计值
     */
    @GetMapping("/type/{statsType}/min")
    public Result<Double> getMinValueByStatsType(@PathVariable String statsType) {
        Double minValue = userStatsService.getMinValueByStatsType(statsType);
        return Result.success(minValue);
    }

    /**
     * 删除过期的统计数据
     */
    @DeleteMapping("/expired")
    public Result<Void> deleteExpiredStats(@RequestParam(defaultValue = "30") Integer days) {
        boolean deleted = userStatsService.deleteExpiredStats(days);
        if (!deleted) {
            return Result.error("删除失败");
        }
        return Result.success();
    }

    /**
     * 转换为响应对象
     */
    private UserStatsResponse convertToResponse(UserStats stats) {
        UserStatsResponse response = new UserStatsResponse();
        BeanUtils.copyProperties(stats, response);
        response.setId(stats.getId());
        if (stats.getCreateTime() != null) {
            response.setCreateTime(stats.getCreateTime().format(DATE_TIME_FORMATTER));
        }
        if (stats.getUpdateTime() != null) {
            response.setUpdateTime(stats.getUpdateTime().format(DATE_TIME_FORMATTER));
        }
        return response;
    }

    /**
     * 用户统计创建请求
     */
    @lombok.Data
    public static class UserStatsCreateRequest {
        @NotBlank(message = "用户ID不能为空")
        private String userId;
        
        @NotBlank(message = "统计类型不能为空")
        private String statsType;
        
        @NotNull(message = "统计值不能为空")
        private Double value;
        
        private String period;
    }

    /**
     * 用户统计响应类
     */
    @lombok.Data
    @lombok.EqualsAndHashCode(callSuper = true)
    public static class UserStatsResponse extends BaseResponse {
        private String userId;
        private String statsType;
        private Double value;
        private String period;
    }
}